UnQTools

463 tools

Developer & Code

463 tools in this category — all running 100% in your browser. No uploads, no tracking, no accounts.

100% Private Works Offline Instant

.bashrc / .zshrc Alias & Config Manager

Build shell aliases, functions, exports, and PATH edits in a visual editor, then export a clean, commented .aliases file sourced from both .bashrc and .zshrc — with shadowing detection against shell builtins and common CLI tools, function suggestions when args are needed, starter packs (git, docker, kubectl, navigation, safety, ls, dev, devops, data science), import of existing rc files, dedupe, history (localStorage), and shareable URL. 100% client-side.

Add / Subtract Date Calculator

Add or subtract years, months, weeks, days, hours, minutes and seconds from a starting date/time. Calendar-day or business-day mode with custom weekend + holiday list. Month-end policy toggle (clamp to last day vs overflow). Repeat/series mode (e.g. every 2 weeks x 10) with CSV export. Shareable URL. 100% client-side.

Add Line Numbers

Add sequential line numbers to text. Custom format, padding, start, step. Skip empty lines.

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AES Encrypt/Decrypt

AES-GCM/CBC/CTR/CFB/OFB/ECB. 128/192/256-bit. PBKDF2 key derivation. WebCrypto.

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Age Calculator

Calculate exact age from a birth date in calendar years/months/days (no negative-day bugs) plus totals in months/weeks/days/hours/minutes/seconds. Next-birthday countdown with weekday. Feb-29 birthday policy toggle. Milestones (1,000 days, 10,000 days, 1 billion seconds). Zodiac sign + Chinese zodiac. Age gap comparison. Shareable URL. 100% client-side.

ANSI Escape Code / Terminal Color Generator

Visually compose terminal text styling — FG/BG color in 16/256/24-bit truecolor, SGR styles (bold, faint, italic, underline, blink, inverse, hidden, strikethrough) — and get the exact ANSI escape sequence with a live preview. Multi-format escape output (\x1b, \033, \e, \u001b, raw ESC), language snippets (bash printf, Python, JS, Go, Rust, C), reverse decoder (paste a sequence → see what it does), hex→256 and hex→truecolor conversion, 256-color palette grid, strip-ANSI helper, terminal-support notes. 100% client-side.

Apache .htaccess Generator

Generate Apache .htaccess rules. Redirects, rewrites, auth, caching, security headers.

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API Authentication Header Builder

Build API authentication headers: Bearer, Basic, API Key, HMAC, AWS Sig v4.

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Argon2 Hash Generator

Argon2id/2d/2i parameter calculator + verifier. PHC parser. OWASP presets. PBKDF2 fallback.

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Arrow Function Converter

Convert JS function expressions to arrow functions and vice versa. Detects this/arguments/super/yield.

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ASCII / Unicode Code Point Explorer (UTF-8/16/32, HTML/CSS/JS Escapes)

Browse ASCII (0–127) and any Unicode code point: see the character, decimal, hex, binary, HTML entity (decimal & hex), URL percent-encoding, CSS escape, JS escape, plus the full UTF-8 / UTF-16 / UTF-32 byte encodings. Search by name, code point, or literal character, and explore every Unicode block. Decompose pasted strings code-point-by-code-point. 100% client-side & offline.

ASCII Art Text Banner Generator

Convert text into ASCII art banners using 10+ bundled font styles (block, banner, standard, big, small, shadow, slant, digital, thin, thick, mini, letters). Each font is hand-tuned with uppercase A–Z, digits 0–9, space, and common punctuation. Choose a character set (hash, block, slash, dot), set a custom output width with line wrapping, flip horizontally or vertically, copy as monospaced text, wrap as Markdown code block or HTML <pre>, and download as .txt or HTML. 100% client-side.

AST Explorer (JS/TS)

Explore Abstract Syntax Trees of JavaScript/TypeScript code. Parse, traverse, inspect nodes.

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Atbash Cipher

Encode/decode Atbash cipher (a↔z, A↔Z). Latin, Hebrew, Greek, Cyrillic alphabets. Self-inverse.

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Autoprefixer Tool

Add vendor prefixes to CSS based on caniuse-like rules. ~30-property database. Browserslist presets.

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AVL Tree Visualizer

Step-by-step visualization of self-balancing AVL tree operations — insert, delete, search, and in-order traversal — with live per-node balance factor badges, automatic imbalance detection, and the four rotations (LL, RR, LR, RL) animated as labeled steps. Double rotations (LR / RL) are split into their two single-rotation phases so you can follow each move. Side-by-side height comparison vs a plain BST on identical input, rotation-count statistics, cascading deletion rebalance, bulk insert, and shareable tree-state URLs. 100% client-side.

awk Command Builder & Tester

Build and test awk one-liners in the browser. A pure-JavaScript awk interpreter (no WASM, no network) runs BEGIN/END blocks, pattern { action } rules, field separators (-F / FS), -v variables, $0/$1/$N, NR/NF, OFS, print/printf, if/while/for, length/tolower/toupper/substr/split, regex patterns, arithmetic, comparisons, and string concatenation. Visual builder (pick columns, add a condition, choose an aggregation → generates the program), per-option plain-English explanation, reverse program explainer, sample-data library, recipe presets, GNU vs POSIX toggle, copy-ready `awk -F',' '{print $1,$3}' file` command, history (max 20), shareable URL. 100% client-side.

Base32 Encode/Decode

RFC 4648 Base32 encoding/decoding (standard, base32hex, Crockford). UTF-8 safe.

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Base58 Encode/Decode

Bitcoin/Ripple/Flickr Base58 encoding with Base58Check checksum support. UTF-8 safe.

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Base64 Decode to Image

Decode Base64 string to image file. Auto-detect format, preview, download.

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Base64 Encode/Decode

Standard/URL-safe/MIME Base64. UTF-8 safe. File support. 100% client-side.

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Base64 Encoder / Decoder

Encode text or files to Base64, or decode Base64 back to text — UTF-8 safe, with URL-safe variant and live byte counter. 100% private.

Base64 Image Encode/Decode

Encode image files (PNG, JPG, WebP, GIF, SVG) to Base64 data URLs. Decode back. Live preview.

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Base64 to Hex Converter

Bidirectional Base64 ↔ Hex conversion. Content-shape detection. UTF-8 safe.

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Bash Prompt (PS1) Generator

Build your Bash or Zsh prompt visually — drag username, hostname, cwd, git branch, time, exit-code, and prompt-symbol elements, set per-element FG/BG color in 16/256/truecolor, and copy the ready-to-paste PS1 (or Zsh PROMPT) with proper \[ \] non-printing wrappers. Includes bundled parse_git_branch helper, two-line prompts, RPROMPT, PS2/PS3/PS4, title-bar escape, Nerd Font glyphs, live preview, presets, history (localStorage), and shareable URL. 100% client-side.

Bash Script Generator / Boilerplate

Generate a hardened, shellcheck-clean Bash script skeleton from a few choices: shebang, strict mode (set -euo pipefail), getopts/long-option flag parser with auto-generated usage() and --help, EXIT/ERR/INT traps with temp-dir cleanup, logging helpers (info/warn/error to stderr with optional colors), dependency-check, dry-run scaffolding, root-required check, OS detection, and positional argument validation. Five presets: file ops, system info, backup, deployment, monitoring. Copy/download .sh, shareable URL. 100% client-side.

Bcrypt Generator/Verifier

Generate and verify bcrypt password hashes. Cost 4-31. $2a/$2b/$2y prefix. Bulk verify.

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Big Integer Arbitrary-Precision Calculator

Evaluate arbitrary-precision integer arithmetic with native BigInt: +, -, *, /, %, **, GCD, LCM, factorial, Fibonacci, modular exponentiation (a^b mod m), Miller-Rabin primality test, base conversion (binary/octal/decimal/hex/base-N up to 36), exact rational mode (fractions kept exact, not floated), and a full shunting-yard expression parser with precedence and parentheses. Result digit count + grouped display + scientific approximation. 100% client-side, no network, no libraries.

Binary Encode/Decode

Encode/decode text as binary (7-bit ASCII, 8-bit UTF-8). Multiple formats supported.

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Binary File Signature & Magic Number Inspector

Detect a file's true type from its leading magic bytes (and trailer where relevant) using a 100+ entry bundled signature database (PNG, JPG, GIF, PDF, ZIP, ELF, PE, Mach-O, OLE, SQLite, WASM, GLB, ISO9660, and more). Show a hex dump of the header bytes with matched bytes highlighted, resolve ZIP-based container subtypes (docx / xlsx / pptx / jar / apk / epub / odt), explicitly warn on extension spoofing, and search the database by extension / MIME / format name / hex signature. 100% client-side, nothing uploaded.

Binary Search Tree (BST) Visualizer

Step-by-step visualization of Binary Search Tree operations — insert, delete (all 3 cases: leaf, one child, two children + successor), and search — with animated comparison path. All four traversals (in-order, pre-order, post-order, level-order) with synchronized node highlighting and output. Live height, node count, balance factor per node, degenerate-tree warning for sorted input, successor / predecessor highlighting, bulk insert from a list, and shareable tree-state URLs. 100% client-side.

Bit Field / Bitmask / Flags Designer & Decoder

Design and decode bit fields / bitmasks visually. Define named single-bit flags and multi-bit fields within a word (8/16/32/64-bit), validate non-overlap, encode field values into a packed integer (bin/hex/dec), decode a packed integer back into named fields, and generate ready-to-compile code for C/C++, Rust bitflags!, Python IntFlag, Go consts and TypeScript. Includes POSIX file-mode, TCP flags, FAT attributes, ARM CPSR and x86 EFLAGS presets. 100% client-side and offline, BigInt-correct at 64-bit.

Bit Shift & Rotate Visualizer (<<, >>, >>>, ROL / ROR)

Visualize left and right shifts (<<, >> arithmetic, >>> logical) plus circular rotates (ROL, ROR) and rotate-through-carry (RCL, RCR) on integers at 8/16/32/64-bit widths. Animated per-bit movement, before/after binary grid, shifted-out bits + carry flag, ×/÷ by 2^k annotation, BigInt-correct at every width. 100% client-side and offline.

Bitwise Operation Calculator (AND / OR / XOR / NOT / Shift)

Evaluate bitwise expressions — AND, OR, XOR, NOT, NAND, NOR, XNOR, left shift, right shift (arithmetic & logical) — on two or more operands in mixed bases (bin/oct/dec/hex). Aligned bit-column grid, truth-table generator, selectable width (8/16/32/64-bit or BigInt), signed/unsigned toggle, and multi-input chained operations. 100% client-side.

Business / Working Days Calculator

Count business days between two dates or add/subtract N working days from a date. Configurable weekends (Sat+Sun, Fri+Sat, Sun-only, Thu+Fri, none), custom holiday list, country holiday presets (US/UK/India/AU/CA 2025–2026), include/exclude end day, half-day handling, day-by-day breakdown, batch ranges with CSV export, saved holiday sets. Shareable URL. 100% client-side.

Cache-Control Header Builder

Build Cache-Control headers visually. max-age, public/private, immutable, no-store.

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Callback to Promise/Async-Await Converter

Convert callback-style functions to Promises and async/await.

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Changelog Generator from Commits

Generate changelogs from git commit messages. Conventional commits, semantic versioning.

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Checksum & Parity Bit Calculator (LRC, Fletcher, Adler, CRC, Luhn, Verhoeff)

Compute parity (even, odd, mark, space), LRC, sum checksums (8/16/32-bit, one's/two's complement, RFC-1071 Internet), XOR, Fletcher-16/32, Adler-32, CRC-8/16/32 (parameterised polynomial), Luhn, Verhoeff and ISBN-10/13 check digits over ASCII, hex, or binary input — with bit-level working, verify mode, endianness control, and history. 100% client-side & offline.

Checksum Verifier

Verify file checksums (MD5, SHA-1, SHA-256, SHA-512). Compare against expected hash.

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Chmod (File Permission) Calculator

Convert Linux/Unix file permissions between octal (755), symbolic (rwxr-xr-x), and a clickable 3×3 grid. Full special-bit support (setuid/setgid/sticky with correct s/S/t/T case), symbolic-mode arithmetic (u+x,go-w), security linter (flags 777/world-writable/setuid on scripts), recursive safe-find pattern, umask companion, copy-ready chmod command, common presets, and shareable URL. 100% client-side.

CIDR ↔ IP Range / Netmask Converter

Convert in every direction between CIDR notation, IP range (start–end), netmask (dotted decimal), and wildcard mask. Decompose any IP range into the minimal exact set of CIDR blocks. Supports both IPv4 and IPv6 with batch conversion of many CIDRs or ranges. 100% client-side.

CIDR Aggregator & Network Summarizer

Aggregate messy lists of IPs, dashed ranges, and CIDR blocks (IPv4 and IPv6) into the smallest possible set of CIDR prefixes. Merges overlapping and adjacent blocks, dedupes, optionally subtracts exclusions, shows before/after prefix and address counts (BigInt), and exports as CIDR list, IP ranges, Cisco ACL, pfSense alias, or nginx allow. 100% client-side.

CircleCI Config Generator

Generate CircleCI configuration files. Jobs, workflows, orbs, docker executors.

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Code to Image Screenshot Generator

Convert code snippets to beautiful images. Syntax highlighting, themes, watermarks.

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Column Extractor (Delimited)

Extract specific columns from delimited text (CSV, TSV). Custom delimiter, column selection.

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CommonJS to ES Modules Converter

Convert require/module.exports to import/export. ES Module syntax.

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Connection String Builder & Parser

Build and parse database connection strings for PostgreSQL, MySQL, MongoDB, Redis, SQL Server, and SQLite. Convert between URI, key/value, and JDBC formats with correct percent-encoding of user, password, and parameters. Validate, mask passwords, multi-host, and SSL params. 100% client-side — secrets never leave the browser.

Console.log/Debug Statement Remover

Remove console.log, debugger, and debug statements from JavaScript.

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Console.log/Debug Statement Remover

Remove console.log, debugger, and debug statements from JavaScript.

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Content Negotiation Helper

Build Accept headers for content negotiation. Media types, quality factors.

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Conventional Commit Message Builder

Build conventional commit messages. feat, fix, docs, chore, scope, breaking changes.

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CORS Tester & Config Generator

Generate CORS headers. Preflight simulator. Server config for Nginx/Apache/Express/Cloudflare.

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Count Occurrences

Count occurrences of words, characters, or patterns in text. Case-insensitive.

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Countdown Timer Generator (Embeddable)

Generate a self-contained, watermark-free, embeddable countdown (or count-up) timer to any target date/time. Output as plain text, HTML widget snippet, or ICS calendar event. Per-visitor or fixed-timezone display, DST-safe, multiple themes/styles, on-finish behavior, recurring annual countdowns. 100% client-side.

CRC32 Calculator

Calculate CRC32 (IEEE 802.3), CRC32C (Castagnoli), CRC32B. Hex + decimal output. File support.

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CREATE TABLE Generator

Design a SQL table visually and generate correct CREATE TABLE DDL for MySQL, PostgreSQL, SQLite, and SQL Server. Add columns, types, defaults, primary keys (single/composite), unique, foreign keys with ON DELETE/UPDATE, indexes, CHECK constraints, ENUMs and comments. Includes CSV/JSON column inference, IF NOT EXISTS, matching DROP TABLE, seed INSERT scaffolding, MySQL engine/charset, SQLite WITHOUT ROWID, reserved-word auto-quoting and per-dialect identifier limits. 100% client-side.

Credit Card Test Number Generator

Generate Luhn-valid, clearly-fake test credit card numbers for sandbox use. Per-brand BIN prefixes (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay, Maestro) with matching expiry, CVV, and cardholder name. Bulk export to JSON/CSV/text. Includes official processor sandbox library (Stripe, Adyen, Braintree, PayPal). 100% client-side — sandbox only, never real.

Cron Expression Builder

Build cron expressions visually. Every minute, hour, day, week, month with preview.

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Cron Expression Parser (Human Readable)

Parse cron expressions to human-readable schedule. Next N run times.

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Crontab Generator

Build cron expressions visually — pick minute/hour/day/month/weekday via every / every-N / specific / range / list controls, get a valid 5-field expression, a plain-English description, the next N run times (timezone-aware), and 15+ presets (every 5 min, hourly, daily, weekly, monthly, weekdays, weekends, quarterly, yearly). Two-way builder↔expression sync, validator (catches the day-of-month vs day-of-week OR-semantics gotcha), Quartz 6/7-field and AWS EventBridge modes. 100% client-side — no network.

CSS @font-face Generator

Generate css @font-face generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Animation (Keyframes) Generator

Generate CSS @keyframes animations visually. Bounce, fade, rotate, slide presets.

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CSS Animation Keyframes Generator

Generate css animation keyframes generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Aspect Ratio Helper

Generate css aspect ratio helper with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Background Pattern Generator

Generate css background pattern generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Beautifier

Generate css beautifier with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Blend Mode Previewer

Generate css blend mode previewer with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Border Radius Generator

Generate css border radius generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Box Shadow Generator

Generate css box shadow generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Button Generator

Generate css button generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Clip-path Generator

Generate css clip-path generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Color Format Converter

Generate css color format converter with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Cubic Bezier Editor

Generate css cubic bezier editor with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Filter Generator

Generate css filter generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Flexbox Playground

Generate css flexbox playground with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Glassmorphism Generator

Generate css glassmorphism generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Gradient Generator

Generate css gradient generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Grid Generator

Generate css grid generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Grid Template Builder

Build CSS Grid templates visually. Areas, columns, rows, gap.

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CSS Grid Template Builder

Build CSS Grid templates visually. Areas, columns, rows, gap.

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CSS Loader/Spinner Generator

Generate css loader/spinner generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Media Query Generator

Generate css media query generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Minifier

Generate css minifier with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Neumorphism Generator

Generate css neumorphism generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Reset/Normalize Snippet

Generate CSS reset or normalize snippets. Modern, minimal, Tailwind-style presets.

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CSS Reset/Normalize Snippet Generator

Generate CSS reset or normalize snippets. Modern, minimal, Tailwind-style.

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CSS Scrollbar Styler

Generate css scrollbar styler with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Selector Tester

Generate css selector tester with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Specificity Calculator

Generate css specificity calculator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Sprite Generator

Generate CSS sprites from multiple images. Background-position, CSS output.

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CSS Sprite Generator

Generate CSS sprites from multiple images. Background-position, CSS output.

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CSS Text Shadow Generator

Generate css text shadow generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS to SCSS Converter

Convert CSS to SCSS. Nesting, variables, mixins, partials.

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CSS to SCSS Converter

Convert CSS to SCSS. Nesting, variables, mixins, partials.

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CSS Tooltip Generator

Generate css tooltip generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Transform Generator

Generate css transform generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Transition Generator

Generate css transition generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Triangle Generator

Generate css triangle generator with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Units Converter

Generate css units converter with live preview, presets, and 10+ extras. 100% private, offline-capable.

CSS Unused Rules Finder

Find unused CSS rules by comparing against HTML. Dead CSS elimination.

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CSS Unused Rules Finder

Find unused CSS rules by comparing against HTML. Dead CSS elimination.

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CSS Variables (Custom Props) Generator

Generate CSS custom properties. Naming, themes, fallback values.

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CSV Column Reorder

Reorder, add, remove columns in CSV data. Drag-and-drop interface with preview.

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CSV to JSON Converter

Convert CSV data to JSON arrays or objects. Custom delimiters, header rows, type inference.

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CSV to SQL INSERT Converter

Convert CSV or TSV data into SQL INSERT statements with smart type inference (int/decimal/boolean/date/text), NULL vs empty-string handling, RFC 4180-correct parsing, batched multi-row inserts, optional CREATE TABLE, and UPSERT (ON CONFLICT / DUPLICATE KEY / MERGE). Multi-dialect (ANSI/MySQL/PostgreSQL/SQLite/T-SQL). 100% client-side.

curl Command Builder

Build curl commands visually. URL, method, headers, body, auth, options.

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curl Command Builder

Build curl commands visually. URL, method, headers, body, auth.

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curl to Code Converter

Convert curl commands to JavaScript, Python, Go, Rust, PHP code.

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curl to Code Converter

Convert curl commands to JavaScript, Python, Go, Rust, PHP code.

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Data URI Decoder

Decode data URIs back to original content. Extract MIME type and data.

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Data URI Generator

Generate data URIs from text or files. Base64 encoding, MIME type detection.

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Database Schema Diff

Compare two database schemas (DDL dumps) and generate a structural diff plus a dependency-ordered ALTER TABLE migration script. Detects added/dropped/changed tables, columns, types, constraints, and indexes; flags data-loss operations. Multi-dialect (ANSI/MySQL/PostgreSQL/SQLite/T-SQL). 100% client-side.

Date Difference Calculator

Calculate the difference between two dates in calendar years/months/days and totals in weeks/days/hours/minutes/seconds. Include/exclude end day toggle with plain-English explanation. Business-days mode with custom weekend + holiday list. Age calculation. 'Ago / from now' phrasing. Batch mode. Shareable URL. 100% client-side.

Date Format Converter (strftime / token)

Convert a date into any custom format string and translate format patterns between 7 ecosystems — strftime (C/Python), Moment/Day.js, Luxon, date-fns, Java SimpleDateFormat, .NET, and Unicode LDML. 200+ format tokens. Live preview, footgun linter (YYYY week-year, DD vs dd, hh vs HH), code snippets per library, best-effort format detection. 100% client-side.

Day of the Week Finder

Find which day of the week any date falls on using Zeller's congruence and Sakamoto's algorithm — plus day-of-year, ISO week, days until/since today, next/previous weekday finder, Nth weekday of month (e.g. 2nd Tuesday), recurring-weekday view across a year range, and Doomsday-rule teaching mode. 100% client-side.

Dice Roller & Random Picker

Roll any dice (d4, d6, d8, d10, d12, d20, d100, custom faces) with full RPG dice-notation support: 3d6+2 modifiers, 4d6kh3 keep-highest, 2d20kl1 advantage/disadvantage, d6! exploding, and multi-term expressions. Plus a random list picker (weighted or unweighted), coin flip, seedable for reproducibility, and roll history + distribution stats. 100% client-side.

DKIM Record Generator & Validator

Build a valid DKIM DNS TXT record (selector._domainkey) from the v / k / p / h / s / t / n tags (RSA 1024/2048/4096 or Ed25519), validate any existing record against RFC 6376, decode every tag with plain-English explanations, estimate the public-key bit length, generate dig / nslookup / kdig (DoH) lookup commands for the selector, generate OpenDKIM keygen + openssl key-generation commands, and split long 2048/4096-bit TXT records into publishable chunks. 100% client-side generation and validation; live lookup requires the network via the generated dig commands.

DMARC Record Generator & Validator

Build a valid DMARC DNS TXT record (_dmarc.<domain>) from the v / p / sp / rua / ruf / fo / adkim / aspf / pct / rf / ri tags (policy none / quarantine / reject, subdomain policy, aggregate & forensic report URIs, failure-reporting options, DKIM & SPF alignment modes, percentage, report format & interval), validate any existing record against RFC 7489, decode every tag with plain-English explanations, validate rua/ruf mailto: syntax, score the policy strength (0–100), generate an enforcement roadmap (none → quarantine → reject), and generate dig / nslookup / kdig (DoH) lookup commands. 100% client-side generation and validation; live lookup requires the network via the generated dig commands.

DNS Propagation Checker Reference

Generate dig / kdig (DoH) / PowerShell Resolve-DnsName commands to check DNS propagation of any record (A, AAAA, CNAME, MX, TXT, NS, SOA, CAA) across 20+ global public resolvers (Google, Cloudflare, Quad9, OpenDNS, AdGuard, NextDNS, Comodo, Verisign, Yandex, etc.) with region metadata. Compare expected vs actual answers (exact / contains / regex). Compute a TTL-based propagation ETA. Generate bash + PowerShell batch scripts, CSV/JSON export, and authoritative-vs-recursive comparison. 100% client-side — generates commands only; actual lookups require running them in your terminal.

DNS Record Lookup Reference

Reference every common DNS record type (A, AAAA, CNAME, MX, TXT, NS, SOA, PTR, SRV, CAA, DS, DNSKEY, RRSIG, DKIM, DMARC, etc.) with format, fields, examples, and use cases. Generate ready-to-paste dig / nslookup / kdig (DoH) / delv (DNSSEC) / host commands for the resolver of your choice (Google, Cloudflare, Quad9, OpenDNS, authoritative, custom). Parse example records into field breakdowns. 100% client-side — generates commands only; actual lookups require running them in your terminal.

DNS-over-HTTPS (DoH) Query Tool

Generate DNS-over-HTTPS (RFC 8484) query URLs and curl/wget/httpie/fetch commands for Cloudflare (1.1.1.1), Google (dns.google), Quad9 (9.9.9.9), and custom DoH resolvers. Both JSON mode (?type=A) and wire-format mode (application/dns-message, base64url-encoded query). Pure-JS DNS message encoder builds the wire-format query from name + type + flags. Parse pasted DoH JSON responses into structured tables (Status, Answer, Authority, Additional, flags AD/RA/RD, Comment). DNSSEC flags (do/cd) toggle, side-by-side resolver comparison, history (localStorage), shareable URL. 100% client-side — generates URLs/commands and parses output only; actual DoH queries require the network.

Docker Compose YAML Generator

Generate docker-compose.yml files. Services, volumes, networks, env.

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Dockerfile Generator

Generate Dockerfiles for various languages. Multi-stage, Alpine, slim, production-ready.

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Dockerignore Generator

Generate .dockerignore files. Exclude node_modules, .git, build artifacts.

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Dotfiles Manager Generator

Scaffold a dotfiles repo + idempotent install script. Pick the configs to track (.bashrc, .vimrc, .gitconfig, .tmux.conf, ssh config, …), choose a manager (GNU Stow / bare-git / chezmoi / Dotbot) with a full comparison table, and get a repo tree, README, idempotent install.sh that backs up existing files, and a secret-safe .gitignore with a 'never commit these' checklist. 100% client-side.

ECDSA Key Generator

Generate ECDSA key pairs. P-256, P-384, P-521 curves, PEM/JWK export.

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Edge-Case / Naughty String Generator

Browse, filter, and export a curated library of 200+ naughty edge-case test strings — the Big List of Naughty Strings plus Unicode, emoji, RTL/bidi overrides, zalgo, SQL injection, XSS payloads, control chars, zero-width, null bytes, boundary values, and more. Categorized, searchable, seed-reproducible random sampling, and one-click export to JSON, CSV, Playwright, Jest, or pytest fixtures. 100% client-side, defensive QA use only.

EditorConfig Generator

Generate .editorconfig files. Indent style, charset, line endings.

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EFF Passphrase Generator

Generate secure passphrases using EFF wordlists. 4-10 words, separators.

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Email Address Generator & Validator

Generate valid-format test email addresses (random or name-based, custom domain) and validate any address in layers — RFC 5322 syntax, domain/TLD sanity, disposable-provider detection, typo suggestion (gmial→gmail), and role-address flag. Batch support, pure JS, 100% client-side.

Endianness (Byte Order) Converter

Convert byte order between big-endian, little-endian and middle-endian (PDP-11) across 16/32/64-bit words. Each ordering is decoded simultaneously as signed / unsigned integer and IEEE 754 float32 / float64, with batch byte-array splitting, per-byte visualization with endianness role labels, and shareable URLs. 100% client-side and offline, BigInt-correct at 64-bit.

Env File Parser & Validator

Parse and validate .env files. Key-value pairs, comments, type checking.

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ER Diagram Designer (Diagram to SQL)

Visually design a database schema in the browser — add entities, columns, primary/foreign keys, and relationships — and generate clean CREATE TABLE DDL for PostgreSQL, MySQL, SQLite, and SQL Server. Topological creation-order output (handles circular FKs), per-dialect reserved-word auto-quoting, migration scripts by diffing two schema versions, DBML import/export, and round-trip with the SQL DDL to ER Diagram Generator (#267). 100% client-side, no signup.

ES Modules to CommonJS Converter

Convert import/export to require/module.exports. CJS syntax.

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ESLint Config Generator

Generate ESLint configurations. Flat config, rules, plugins, environments.

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Exit Code & Signal Reference

Decode any Unix exit code (0–255) including the 128+N signal rule (137 = SIGKILL, 139 = SIGSEGV, 143 = SIGTERM), with a complete bidirectional signal table (number ↔ name ↔ default action ↔ catchable), sysexits.h reference (EX_USAGE 64 … EX_CONFIG 78), reserved-range guidance, bash scripting snippets ($?, trap, set -e), Docker OOM 137 callout, and search by code OR signal name. 100% client-side — pure lookup, runs offline, no ads.

Fake Data Generator (Faker)

Generate realistic-but-fake structured records in JSON, CSV, NDJSON, or SQL. 40+ field types (names, emails, phones, addresses, UUIDs, IPs, URLs, companies, lorem ipsum, dates, money, colors, ISBNs, semver). Batch generation, deterministic seed, schema editor, history. 100% client-side.

Favicon Link Tag Generator

Generate favicon link tags for HTML. All sizes, Apple touch, manifest.

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File Hash Calculator

Calculate multiple hash algorithms for any file. MD5, SHA-1, SHA-256, SHA-512, CRC32.

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Find & Replace (Multi-pattern)

Find and replace multiple patterns in text. Regex support, CSV import.

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find Command Builder

Build correct find commands visually — path, name glob, type (f/d/l), size, time (mtime/mmin/newer), depth, permissions, owner, actions (print, exec \; / exec +, xargs, delete), boolean AND/OR/NOT with properly-escaped parentheses. Toggle GNU vs BSD/macOS variants. Per-option plain-English explanation, dangerous-action warnings (-delete/-exec rm), -print0/xargs -0 safe pattern, recipe library, history (max 20), shareable URL. 100% client-side — commands are generated, never executed.

Fixed-Point Q-Format Converter (Qm.n)

Convert between real numbers and fixed-point Qm.n representations (signed Qm.n or unsigned UQm.n) used in DSP, embedded, and FPGA work. Configurable integer bits (m) and fractional bits (n), three rounding modes (round-half-up, round-to-even, truncate), two overflow modes (saturate, wrap), live resolution (2^-n) and representable range, exact quantization error, raw stored integer in dec / hex / bin, a clickable bit grid with integer | fraction split, and presets (Q7, Q15, Q31, UQ8.8, UQ16.16). BigInt-correct, 100% client-side.

Git Branch Naming Workflow Helper

Generate git branch names following conventions. feature/, bugfix/, release/, hotfix/.

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Git Command Builder & Cheatsheet

Build git commands visually. Commit, branch, merge, rebase, cherry-pick. Cheatsheet.

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Git Diff Viewer (Unified/Split)

View git diffs in unified or split format. Syntax highlighting, line numbers.

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Gitattributes Generator

Generate .gitattributes files. Line endings, binary files, export-ignore.

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GitHub Actions Workflow Generator

Generate GitHub Actions workflow YAML. Jobs, steps, matrix, secrets, triggers.

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GitHub Badge (shields.io) Generator

Build shields.io badge URLs with correct escaping — static and dynamic badges, brand presets, logo + style + named/hex color pickers, link wrapping, and Markdown/HTML/RST/AsciiDoc embed output. Coverage, npm version, downloads, license, GitHub stars/forks/issues, build status, custom badges, batch row builder, history (localStorage), shareable URL. 100% client-side.

Gitignore Generator

Generate .gitignore files for any language/framework. Templates.

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GitLab CI Config Generator

Generate GitLab CI/CD configuration. Stages, jobs, rules, artifacts, cache.

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Glob Pattern Tester

Test glob patterns against file paths with *, **, ?, [abc], [a-z], [!x], and {a,b} brace expansion. Convert glob to regex, explain each token, highlight matches, and resolve multi-pattern include/exclude sets. Four flavors: shell glob, .gitignore, minimatch/picomatch, and tsconfig. Toggle case-sensitivity, dot (hidden files), and globstar. Directory tree view, sample paths, presets, history (localStorage), and shareable URL. 100% client-side.

GraphQL Client Explorer

Explore GraphQL APIs. Introspection, query builder, variables, fragments.

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GraphQL Client Explorer

Explore GraphQL APIs. Introspection, query builder, variables, fragments.

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Gray Code Converter (Binary ↔ Gray, Sequence, N-ary, Balanced)

Convert between binary/decimal and reflected Gray code in both directions with XOR-step working, generate n-bit Gray-code sequences (0…2ⁿ−1) with the single-bit-change property highlighted, build n-ary and balanced Gray codes, and view the full truth table. BigInt support for wide values. 100% client-side & offline.

grep / ripgrep Command Builder

Build grep and ripgrep (rg) commands side-by-side from a visual UI. Toggle flags (ignore-case, whole-word, invert, count, line-numbers, recursive, fixed-string), choose regex flavor (BRE / ERE / PCRE / Rust regex), add file globs and context lines, then test the pattern against sample text live with the correct regex flavor. Per-flag plain-English explanation, grep↔rg translation table, recipe library, history (max 20), shareable URL. 100% client-side — your sample text never leaves the browser.

Gzip/Deflate Text Compressor

Compress text using gzip/deflate via CompressionStream API. Show before/after size.

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Hamming Code Error-Correction Calculator

Encode data bits into Hamming(7,4), Hamming(15,11), or Hamming(31,26) codes with parity at powers of two, decode received codewords via the syndrome, correct any single-bit error, and detect double-bit errors with SECDED extended Hamming. Interactive bit-flip error injection, per-parity-bit coverage display, even/odd parity mode, copy codeword, history (localStorage), and shareable URL. 100% client-side.

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files, with hex and Base64 output. Uses Web Crypto — 100% private.

Heap & Priority Queue Visualizer

Step-by-step visualization of a binary heap (min or max) with synchronized tree + array views and live index math (parent=(i-1)/2, children=2i+1/2i+2). Insert with sift-up, extract with sift-down, build-heap (heapify) in O(n), peek / size / height, priority-queue operations (change-priority, decrease-key, increase-key), one-click heapsort demo, build-heap vs n-inserts comparison, step / reverse / play / speed controls, and shareable state URLs. 100% client-side.

Helm Values YAML Helper

Generate and validate Helm values.yaml files. Templates, charts, overrides.

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Hex Dump Viewer & Editor (with Data Inspector)

Display binary data as a classic hex dump (offset | hex bytes | ASCII gutter) with in-place editing, byte insert/delete with undo, search by hex bytes / ASCII text / regex, goto offset, multi-format display (hex / decimal / binary / octal), a data inspector decoding int8/16/32/64 (signed & unsigned), float32/64, LEB128, and strings (ASCII / UTF-8 / UTF-16) at the cursor in both endiannesses, and file import via ArrayBuffer. 100% client-side, nothing uploaded.

Hex Encode/Decode

Encode/decode text as hexadecimal. UTF-8 safe, with byte separator options.

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Hex to Base64 Converter

Convert between hexadecimal and Base64 formats. Bidirectional, UTF-8 safe.

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HMAC Generator

Generate HMAC signatures using WebCrypto. HMAC-SHA256, SHA384, SHA512 support.

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HTML Beautifier

Format and beautify HTML with configurable indent, line wrapping, and attribute sorting.

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HTML Email CSS Inliner

Inline CSS styles into HTML for email compatibility. Style tag to inline conversion.

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HTML Entity Encode/Decode

Encode/decode HTML entities including named, decimal, and hex references.

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HTML Entity Reference

Reference for all HTML entities. Named, decimal, hex, common symbols.

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HTML Escape/Unescape

Escape/unescape HTML entities. < > & " ' conversion.

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HTML Form Builder

Build HTML forms visually. Input types, validation, labels, accessibility attributes.

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HTML Image Extractor

Extract all image URLs and alt text from HTML. Bulk download option.

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HTML Link Extractor

Extract all links (href) and anchor text from HTML. Internal/external classification.

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HTML Live Preview Editor

Edit HTML/CSS/JS with live preview. Side-by-side code and rendered output.

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HTML Minifier

Minify HTML by removing whitespace, comments, and redundant attributes. Gzip estimate.

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HTML Table Generator

Generate HTML tables from CSV/JSON data or visual editor. Headers, styling, accessibility.

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HTML Table to CSV Converter

Extract tables from HTML and convert to CSV. Multiple table support.

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HTML to JSX Converter

Convert HTML to JSX syntax. className, self-closing tags, style objects.

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HTML to Markdown Converter

Convert HTML to Markdown. Preserve headings, lists, links, images, code blocks.

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HTML to Plain Text

Strip HTML tags and convert to plain text. Preserve line breaks and basic formatting.

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HTML to Pug Converter

Convert HTML to Pug/Jade template syntax. Indentation-based, concise.

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HTML Validator

Validate HTML syntax against HTML5 spec. Detect unclosed tags, mismatched attributes.

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HTML5 Boilerplate Generator

Generate HTML5 boilerplate with meta tags, Open Graph, favicons, and PWA manifest.

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HTML5 Semantic Checker

Check HTML5 semantic structure. Header, nav, main, article, section, aside, footer.

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HTTP Headers Reference & Analyzer

Reference for all HTTP headers. Analyze request/response headers, security, caching.

IBAN Generator & Validator

Generate valid test IBANs for 70+ countries and validate/decode any IBAN with MOD-97 checksum, per-country length rules, BBAN structural breakdown, batch processing, and print/electronic formatting. 100% client-side — test/sandbox IBANs only, structurally valid but unassigned.

IEEE 754 Floating-Point Converter (binary16 / 32 / 64 / 128)

Convert between decimal and IEEE 754 binary representations (binary16 half, binary32 single, binary64 double, binary128 quad). Show sign / exponent / mantissa bit fields, the exact stored value via BigInt, absolute & relative rounding error, classification (normal / subnormal / ±0 / ±inf / qNaN / sNaN), a clickable bit grid, ULP next/previous stepping, hex-float parsing (0x1.8p+1), and side-by-side precision comparison. 100% client-side, BigInt-correct for all four widths.

iFrame Generator

Generate HTML iframe tags. Src, width, height, sandbox, loading.

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Import Dependency Graph Visualizer

Visualize import dependency graphs. Detect circular deps, unused modules.

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In-Browser SQL Playground

Run SQL entirely in your browser — no server, no signup, no data leaving the device. A pure-JS SQL engine executes CREATE TABLE, INSERT, and SELECT (WHERE, JOIN, GROUP BY, HAVING, ORDER BY, LIMIT, DISTINCT) against in-memory tables. Export results as CSV/JSON/Markdown. Schema browser, sample datasets, query history, shareable URL. 100% client-side.

Integer Data Type Range & Overflow Reference

Reference table for integer types (int8, uint8, int16, …, int64, uint64, size_t, intptr_t, byte, char, short, long, i32, u64, isize, usize) across C/C++, Rust, Go, Java, C#, JavaScript and Python. Show min/max (BigInt-exact), bit width, overflow behavior, format specifiers and copyable language constants. Interactive overflow calculator — enter a value and a type, see whether it fits and exactly how it wraps/saturates/panics/errors per language. 100% client-side, no network.

IP Address Format Converter

Convert an IPv4 address between dotted-decimal, 32-bit integer, hexadecimal (0xC0A80001), octal, dotted-binary, dotted-hex and dotted-octal with a per-octet breakdown. Convert IPv6 between its 128-bit integer, hex, expanded and RFC 5952 compressed forms. Auto-detect the input format (0x/0b/0 prefixes, mixed dotted-hex like 0xC0.0xA8.0.1) and batch-convert lists. 100% client-side with BigInt 128-bit math.

IPv4 Subnet Calculator (CIDR / VLSM)

Compute network, broadcast, first/last usable host, host count, subnet & wildcard mask, IP class, and private/reserved detection from an IPv4 address + CIDR (or dotted / inverse mask). Includes binary bit visualization, even split into N subnets, VLSM best-fit allocation from host requirements, overlap / containment checker between two blocks, and CSV / JSON export. 100% client-side.

IPv6 Expander, Compressor & Validator

Expand a compressed IPv6 address to its full 128-bit form, compress a full address to its RFC 5952 canonical short form, validate it, and see exactly which rules were applied (leading-zero removal, '::' run selection). Get every valid representation, classify the address type (loopback, link-local, ULA, multicast, global, IPv4-mapped, unspecified), and batch-process lists. Handles embedded IPv4 (::ffff:192.0.2.1) and zone IDs (%eth0). 100% client-side with BigInt 128-bit math.

IPv6 Subnet Calculator

Compute IPv6 network address, first/last address, total address count (BigInt-exact) and number of /64s from an address + prefix length. Expand and compress addresses (RFC 5952 canonical form), show the 128-bit binary representation with nibble markers, subdivide a prefix into smaller child prefixes (e.g. /48 → /56 → /64), and generate the ip6.arpa reverse DNS zone. 100% client-side with BigInt 128-bit math.

ISBN Generator & Validator

Generate valid test ISBN-10 and ISBN-13 numbers with correct check digits, validate any ISBN with structural reason codes, convert ISBN-10 ↔ ISBN-13 (978/979 handling), parse ISBNs into prefix/group/publisher/title/check components with range-table hyphenation, and bulk-process up to 5k rows. 100% client-side — test ISBNs only, structurally valid but unregistered.

ISO 8601 Date Parser & Formatter

Parse any ISO 8601 / RFC 3339 string into its components and format a date into every ISO 8601 variant — calendar, week, ordinal, datetime, duration, interval, recurring. Forgiving tokenizer accepts basic + extended format, comma or dot decimals, Z or offset, negative/expanded years, leap seconds, 24:00:00, week 53. Strict vs lenient modes. Code snippets in JS/Python/Java/Go. 100% client-side.

JavaScript Beautifier

Format and beautify JavaScript code. Indent, semicolons, quote style.

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JavaScript Beautifier

Format and beautify JavaScript code. Indent, semicolons, quote style.

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JavaScript Beautifier & Formatter

Format and beautify JavaScript code. Indent, semicolons, quotes.

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JavaScript Bundle Size Analyzer

Analyze JavaScript bundle size. Import tree, minified+gzip estimates.

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JavaScript Bundle Size Analyzer

Analyze JavaScript bundle size. Import tree, minified+gzip estimates.

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JavaScript Code Complexity Analyzer

Analyze cyclomatic complexity of JavaScript functions. Halstead metrics.

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JavaScript Deobfuscator

Deobfuscate minified JavaScript. Beautify, rename variables, decode strings.

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JavaScript Linter (In-Browser)

Lint JavaScript code in browser. ESLint rules, fix suggestions.

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JavaScript Linter (In-Browser)

Lint JavaScript code in browser. ESLint rules, fix suggestions.

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JavaScript Minifier

Minify JavaScript. Remove whitespace, comments, shorten variables.

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JavaScript Minifier

Minify JavaScript. Remove whitespace, comments, shorten variables.

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JavaScript Obfuscator

Obfuscate JavaScript code. Variable renaming, string encoding, control flow.

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JavaScript Obfuscator

Obfuscate JavaScript code. Variable renaming, string encoding, control flow.

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JavaScript Playground/REPL

Run JavaScript code in browser. Console output, error reporting, examples.

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JavaScript Playground/REPL

Run JavaScript code in browser. Console output, error reporting, examples.

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JavaScript to TypeScript Converter

Convert JavaScript to TypeScript. Add types, interfaces, fix any types.

JavaScript to TypeScript Converter

Convert JavaScript to TypeScript. Add types, interfaces, fix any types.

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JavaScript Unit Test Runner

Run JavaScript unit tests in browser. Assert, describe, it, expect.

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jq Playground & Filter Builder

A pure-JavaScript jq playground: paste JSON, type or build a jq filter visually, see the transformed output instantly. Built-in jq interpreter (no WASM, no network) supporting identity, field access, array iteration, select, map, sort, sort_by, group_by, keys, values, length, to_entries, from_entries, pipe, array/object constructors, arithmetic, comparisons, recursive descent, unique, has, contains, first/last, and limit. Visual filter builder (select fields, filter, map, sort, group), per-step plain-English explanation, sample JSON, flag toggles (-c, -r, -s, -S), shareable URL, history. 100% client-side.

JS Object to JSON Converter

Convert JavaScript object literals to JSON. Quote keys, remove trailing commas.

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JS Object to JSON Converter

Convert JavaScript object literals to JSON. Quote keys, remove commas.

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JSDoc Comment Generator

Generate JSDoc comments from JavaScript functions. Params, returns, types.

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JSDoc Comment Generator

Generate JSDoc comments from JavaScript functions. Params, returns.

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JSON Diff & Compare

Compare two JSON objects and highlight differences. Deep diff with path tracking.

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JSON Escape/Unescape

Escape/unescape JSON strings. Handle quotes, backslashes, control characters, unicode.

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JSON Flattener/Unflattener

Flatten nested JSON to dot-notation keys and back. Useful for form data and spreadsheets.

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JSON Flattener/Unflattener

Flatten nested JSON to dot-notation keys and back. Useful for form data.

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JSON Flattener/Unflattener

Flatten nested JSON to dot-notation keys and back.

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JSON Formatter

Format, validate, minify, and sort JSON — fully in your browser.

JSON Key Sorter

Sort JSON object keys alphabetically or custom order. Recursive sorting option.

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JSON Minifier

Minify JSON by removing whitespace, comments, and unnecessary characters. Gzip estimate.

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JSON Schema Generator

Generate JSON Schema from JSON data. Draft 7, 2020-12, with type inference.

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JSON Schema Validator

Validate JSON against a JSON Schema. Draft 7, 2020-12 support with detailed errors.

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JSON to C# Class Converter

Convert JSON to C# class definitions with properties and attributes.

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JSON to CSV Converter

Convert JSON arrays/objects to CSV. Nested object flattening, custom delimiters.

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JSON to Go Struct Converter

Convert JSON to Go struct definitions with proper types and tags.

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JSON to GraphQL Schema

Convert JSON data to GraphQL schema definitions. Types, inputs, queries, mutations.

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JSON to Java POJO

Convert JSON to Java POJO classes. Getters, setters, builders, Lombok support.

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JSON to Java POJO

Convert JSON to Java POJO classes. Getters, setters, builders, Lombok.

JSON to Java POJO

Convert JSON to Java POJO classes. Getters, setters, Lombok.

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JSON to JS Object Literal

Convert JSON to JavaScript object literal syntax. Quote keys, trailing commas.

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JSON to JS Object Literal Converter

Convert JSON to JavaScript object literal. Unquoted keys, trailing commas.

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JSON to Kotlin Data Class

Convert JSON to Kotlin data classes. Null safety, default values, Gson/Moshi.

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JSON to Kotlin Data Class

Convert JSON to Kotlin data classes. Null safety, default values, Gson/Moshi.

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JSON to Kotlin Data Class

Convert JSON to Kotlin data classes. Null safety, Gson/Moshi.

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JSON to Python Class

Convert JSON to Python dataclasses or Pydantic models. Type hints, defaults.

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JSON to Python Class

Convert JSON to Python dataclasses or Pydantic models. Type hints.

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JSON to Python Class

Convert JSON to Python dataclasses or Pydantic models.

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JSON to Query String

Convert JSON object to URL query string. URL encoding, array handling.

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JSON to Rust Struct

Convert JSON to Rust structs with serde derives. Serde, Default, Debug.

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JSON to Rust Struct

Convert JSON to Rust structs with serde derives. Serde, Default, Debug.

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JSON to Rust Struct

Convert JSON to Rust structs with serde derives.

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JSON to SQL

Convert JSON data to SQL INSERT statements or CREATE TABLE. Multiple dialects.

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JSON to TOML

Convert JSON to TOML configuration format. Tables, arrays, inline tables.

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JSON to TypeScript Interface

Convert JSON to TypeScript interfaces. Type inference, optional props, unions.

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JSON to TypeScript Interface

Convert JSON to TypeScript interfaces. Type inference, optional props, unions.

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JSON to TypeScript Interface

Convert JSON to TypeScript interfaces. Type inference, optional.

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JSON to XML

Convert JSON to XML. Attributes, namespaces, custom root element.

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JSON to YAML

Convert JSON to YAML. Multi-document, anchors, comments, custom indent.

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JSON Validator

Validate JSON syntax with detailed error messages. Line/column reporting for errors.

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JSON Viewer (Tree)

Interactive JSON tree viewer. Expand/collapse nodes, search, copy paths, export.

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JSON-RPC Request Builder

Build JSON-RPC 2.0 requests. Method, params, id, batch requests.

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JSON-RPC Request Builder

Build JSON-RPC 2.0 requests. Method, params, id, batch.

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JSONPath Evaluator

Evaluate JSONPath expressions against JSON data. Highlight matches.

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JSX to JavaScript Compiler

Compile JSX to plain JavaScript. React.createElement, fragments.

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JSX to JavaScript Compiler

Compile JSX to plain JavaScript. React.createElement, fragments.

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JSX to JavaScript Compiler

Compile JSX to plain JavaScript. React.createElement.

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Julian Date & Astronomical Time Converter

Convert between Julian Date (JD), Modified Julian Date (MJD), Reduced/Truncated/Dublin JD, Rata Die, days since J2000.0, Unix epoch, and Gregorian calendar date/time. Supports BC dates, proleptic Gregorian AND Julian calendar systems, fraction-of-day, and the separate mainframe ordinal 'Julian date' (YYDDD/YYYYDDD). High precision, fully client-side.

JWT Generator & Signer

Generate and sign JWT tokens. HS256/RS256/ES256, custom claims.

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JWT Generator & Signer

Generate and sign JWT tokens. HS256/RS256/ES256, custom claims.

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JWT Generator & Signer

Generate and sign JWT tokens. HS256/RS256/ES256, claims.

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JWT Verifier

Verify JWT signatures. HS256/RS256/ES256, expiry, claims validation.

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Kubernetes Manifest Generator

Generate Kubernetes manifests. Deployments, services, ingress, configmaps.

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Less to CSS Compiler

Compile Less to CSS. Variables, mixins, nested rules.

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Less to CSS Compiler

Compile Less to CSS. Variables, mixins, nested rules.

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Luhn / Credit Card Validator

Validate identification numbers with the Luhn (mod-10) checksum — credit cards, IMEI, gift cards. Brand detection from BIN, step-by-step doubling visualization, corrected check-digit suggestion, transposition/typo hint, masked display, and bulk list mode with CSV export. 100% client-side — numbers never leave the browser.

MAC Address Vendor (OUI) Lookup & Formatter

Look up the vendor (OUI) for any MAC address against a bundled IEEE registry (200+ vendors, MA-L/MA-M/MA-S/IAB longest-prefix matching), reformat between colon, hyphen, Cisco dot, and bare hex notations, decode U/L (locally-administered) and I/G (multicast) bits, reverse-search vendor → prefixes, generate random vendor-correct MACs, batch lookup, and CSV export. 100% client-side, offline, no network.

Makefile Generator

Generate Makefiles for various project types. Targets, variables, patterns.

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man Page / TLDR Command Reference

Instant, offline-capable, example-first TLDR reference for 60+ common CLI commands (ls, grep, find, tar, ssh, curl, docker, kubectl, git, …) — searchable by command name or by task ('compress a folder' → tar/zip examples), with platform variants (common / linux / osx / windows / sunos), related-commands see-also links, deep-links to the full man7.org man page, favorites and recent history (localStorage), and a shareable deep-link to any command. 100% client-side — the tldr corpus is bundled, nothing is uploaded. No ads.

Markdown Linter & Formatter

Lint Markdown against 25+ markdownlint-compatible rules (MD001–MD058) and auto-format with one click. Violations are reported with rule IDs, line numbers, fixable markers, and human messages. Configurable options: line length, list marker (-, *, +), heading style (atx vs setext), code fence style (backtick vs tilde), emphasis style, trailing spaces, blank lines around blocks. Auto-fix, copy, download, history (localStorage, max 20), shareable URL. 100% client-side.

Markdown Live Editor & Previewer

A split-pane markdown editor with instant GitHub-flavored live preview. Renders headings, bold, italic, lists, links, images, code blocks (with syntax highlighting), tables, blockquotes, and hr. Word/char/line/reading-time counts, autosave, dark mode, copy/download .md and .html, shareable URL. 100% client-side — your document never leaves the browser.

Markdown Preview

Live markdown preview with syntax highlighting. GitHub-flavored markdown support.

Markdown Syntax Cheatsheet & Reference

A searchable Markdown syntax cheatsheet with 60+ entries across basic Markdown, GFM, CommonMark, and extended flavors (alerts, task lists, footnotes, strikethrough, math, mermaid, autolinks, emoji). Each card shows source + live rendered output + a flavor-support matrix (CommonMark / GFM / GitLab / pandoc / Obsidian) and a copy button. Scratch pad to test any snippet. 100% client-side — no network.

Markdown Table Generator

Build a markdown table visually — add/remove rows & columns, edit cells, set per-column alignment (L/C/R), toggle the header row, then export valid GFM. Import from CSV/TSV or paste an existing markdown table to round-trip edit it. Also export HTML, CSV, JSON, or Jira. Pipes and newlines in cells are escaped automatically. 100% client-side.

Markdown to HTML Converter

Convert markdown to HTML. GitHub-flavored, syntax highlighting, table support.

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Markdown to HTML Converter

Convert markdown to HTML. GitHub-flavored, syntax highlighting, tables.

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Markdown to Slides (Presentation) Generator

Convert a Markdown document into an HTML slide deck — split on `---` or `## ` headings into slides, generate reveal.js-compatible HTML with theme picker, extract speaker notes from HTML comments, preview slides, and export a self-contained HTML file. Supports Marp-style directives, code highlighting hints, image embedding, and per-slide layouts. 100% client-side, zero install, zero upload.

Markdown TOC Generator

Generate a clickable Markdown table of contents from any document's headings. Per-platform slug algorithm (GitHub, GitLab, pandoc, Bitbucket, generic), duplicate-heading disambiguation (-1, -2…), code-fence-aware parsing, setext heading support, depth range control, skip-first-heading, ordered or bullet list style, and insert/update at a [TOC] or  marker. 100% client-side.

MD5 Hash Generator

Generate MD5 hashes. Text/file input, hex/base64 output, RFC 1321.

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Merge Conflict Resolver

Resolve git merge conflicts visually. Side-by-side, pick lines, auto-resolve.

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Mermaid Diagram Live Editor

Validate Mermaid syntax, detect diagram type (flowchart, sequence, class, ER, gantt, pie, state, mindmap, gitGraph, journey, C4, timeline, quadrant, requirement, xychart), generate a shareable mermaid.live preview URL with base64 encoding, browse a syntax reference per type, and export as PNG or SVG via the live editor. Template gallery, line-anchored error decoder, history (localStorage), shareable URL. 100% client-side.

Mock CSV Data Generator

Generate realistic mock CSV datasets — define columns with types (string, number, date, boolean, email, phone, name, address, uuid, url, custom), choose row count, delimiter (comma/semicolon/tab/pipe), header toggle, quoting policy, line endings (LF/CRLF), BOM toggle, infer columns from pasted header, seedable for reproducibility. Export as CSV/TSV/JSON. Unlimited rows, 100% client-side, no row caps, strict RFC 4180.

Mock GraphQL Response Generator

Generate realistic mock GraphQL responses from a pasted SDL schema and optional query. Type-aware mock generation with Faker-mapped scalars (String/Int/Float/Boolean/ID/Date/Email/URL/UUID/JSON), list sizing, enums, unions/interfaces with __typename resolution, fragments & aliases, per-field overrides, nullable/error-state injection, MSW/Apollo resolver snippet export. 100% client-side, no schema upload.

Mock REST API Generator

Generate mock REST API responses. Custom endpoints, status codes, delays.

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Mock REST API Generator

Generate mock REST API responses. Custom endpoints, status codes, delays.

Mock SQL Data Generator

Generate realistic fake test data from a SQL schema and emit INSERT statements, CSV, or JSON. Parse CREATE TABLE DDL or define fields manually; per-column data types include names, emails, dates, numbers, addresses, UUIDs, IPs, ENUMs and regex patterns. FK-aware relational generation (child rows reference valid parent keys), deterministic seed for reproducible data, blank %, unique constraints, batched INSERTs, and per-dialect output (MySQL, PostgreSQL, SQLite, SQL Server). Unlimited rows, 100% client-side, no server.

Modular Arithmetic & GCD/LCM Calculator (CRT, Bézout, Mod-Inverse)

BigInt-exact modular arithmetic: a mod m (floor or truncated), modular add/subtract/multiply/exponentiation (binary exponentiation), GCD/LCM of two or more numbers, extended Euclidean algorithm with Bézout coefficients, modular inverse with existence check, and a Chinese Remainder Theorem solver for a system of congruences — with step-by-step Euclid tables. 100% client-side & offline.

MongoDB Aggregation Pipeline Builder

Build MongoDB aggregation pipelines stage-by-stage with $match, $project, $group, $sort, $limit, $skip, $unwind, $lookup, $addFields, $count, and $facet. Per-stage live preview on pasted sample documents. Accumulators ($sum, $avg, $push, $first, $last, $max, $min, $count) and expressions ($cond, $switch, $concat, $toUpper, $toLower, $add, $subtract, $multiply, $divide, $dateToString, $ifNull, $literal). Export pipeline JSON + driver code for mongosh, Node, Python, Java, C#, and PHP. Stage enable/disable toggle, drag-reorder, shareable URL, history. 100% client-side.

MongoDB Query Builder

Build MongoDB queries visually with AND/OR/NOR grouping, $eq/$ne/$gt/$gte/$lt/$lte/$in/$nin/$regex/$exists/$type/$size/$mod/$not operators, projection, sort, limit, skip, and operation modes (find / findOne / insertOne / updateMany / updateOne / replaceOne / deleteMany / deleteOne). Generates MQL JSON, mongosh, and driver code for Node, Python, Java, C#, and PHP. Runs an in-browser MQL filter engine against pasted sample documents. 100% client-side.

Morse Code Encode/Decode

Convert text to Morse code and back. Audio playback, ITU standard.

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Multi-line to Single-line Converter

Convert multi-line text to single line. Custom separator, trim options.

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Multi-line to Single-line Converter

Convert multi-line text to single line. Custom separator, trim options.

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NanoID Generator

Generate NanoIDs. Custom alphabet, length, bulk generation.

NDJSON/JSON Lines Viewer

View and parse NDJSON (JSON Lines) files. One JSON object per line.

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NDJSON/JSON Lines Viewer

View and parse NDJSON (JSON Lines) files. One JSON object per line.

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Nginx Config Generator

Generate Nginx configuration files. Server blocks, reverse proxy, SSL.

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Number Base Converter (Binary / Octal / Decimal / Hex / Base 2–36)

Convert a number between any two bases from 2 to 36 — binary, octal, decimal, hex, base32, base36 — with BigInt precision, place-value expansion, fractional radix-point support, signed two's-complement mode, plus base58 and base64 byte-encoding shortcuts. Auto-detects 0x/0b/0o prefixes, groups long binary/hex output, and batch-converts a list of numbers. 100% client-side.

Online Stopwatch & Timer

A drift-free stopwatch (with laps/splits), countdown timer (with alarm) and Tabata interval timer — timestamp-anchored for accuracy after backgrounding or sleep. Run multiple named timers at once, see lap analytics (fastest/slowest/avg), export laps as CSV, use Pomodoro & Tabata presets, fire a Web Audio beep alarm, drive everything from the keyboard. State persists across refresh. 100% client-side.

Open Graph Tag Generator

Generate Open Graph meta tags. og:title, og:image, og:url, og:type.

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OpenAPI to Client SDK Generator

Generate client SDKs from OpenAPI specs. JavaScript, Python, Go, Rust.

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OpenAPI to Client SDK Generator

Generate client SDKs from OpenAPI specs. JS, Python, Go, Rust.

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OpenAPI/Swagger Viewer & Editor

View and edit OpenAPI/Swagger specs. Syntax highlighting, validation, preview.

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OpenAPI/Swagger Viewer & Editor

View and edit OpenAPI/Swagger specs. Syntax highlighting, validation.

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package.json Generator

Generate package.json files. Dependencies, scripts, metadata, types.

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Pathfinding Algorithm Visualizer

Step-by-step visualization of 6 grid pathfinding algorithms (BFS, DFS, Dijkstra, A*, Greedy Best-First, Bidirectional BFS) with selectable heuristics (Manhattan, Euclidean, Chebyshev, Octile), paintable walls and weighted cells, maze generators (recursive division, Prim, randomized DFS), diagonal-movement toggle, custom grid input (rows, cols, walls, weights), play / pause / step-forward / step-back controls, visited / path / distance counters, and shareable grid URLs. 100% client-side.

PBKDF2 Generator

Generate PBKDF2 key derivations. SHA-256/384/512, iterations, salt.

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Percent Encoding (URL Encode)

Percent-encode/decode URL components. RFC 3986, reserved/unreserved chars.

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Phone Number Generator & Validator

Generate valid-format test phone numbers for 30+ countries and validate, parse, and format any number across E.164, international, national, and RFC 3966 (tel:) forms. Detects country, type (mobile/fixed/toll-free), and structural validity — pure JS, 100% client-side, no network.

Ping & Latency Tester (Browser)

Generate ready-to-paste ping commands for Windows, Linux and macOS (count, interval, timeout, payload size, flood/no-resolve flags). Build a browser HTTP fetch-timing plan that uses the Performance API to measure round-trip latency — because browsers can't send ICMP. Pure latency statistics calculator: min / max / avg / stddev / jitter / packet-loss, plus a histogram and CSV export. 100% client-side — actual fetch timing needs the network; command generation and stats never do.

PlantUML Diagram Editor

Validate PlantUML syntax, detect diagram type (sequence, class, use case, activity, component, state, object, deployment), generate a shareable plantuml.com render URL (deflate+base64 encoded), browse a syntax reference per type, and export as PNG, SVG, or ASCII art via the official server. Template gallery, line-anchored error decoder, history (localStorage), shareable URL. 100% client-side.

Prettier Config Generator

Generate Prettier configuration files. Print width, tabs, semicolons.

Prime Number Checker & Factorization Tool (Miller–Rabin, Pollard's Rho)

Check whether a number is prime with deterministic Miller–Rabin (64-bit) and probabilistic Miller–Rabin for larger integers, factorize any composite into its prime factors using trial division + Pollard's rho, generate primes with the Sieve of Eratosthenes, find prime gaps and twin primes, and compute divisor count/sum plus Euler's totient — all BigInt-exact and 100% client-side.

Printable Calendar Generator

Generate clean, print-perfect printable calendars (monthly, yearly, weekly, multi-month grid) for any year as HTML with print CSS. Sunday / Monday / Saturday week start, locale month & day names, ISO week numbers, day-of-year, offline holiday presets (US / UK / EU), custom events, theme colors, paper sizes (Letter / Legal / A3 / A4 / A5 / Tabloid / custom), portrait / landscape. 100% client-side, no watermark.

Protobuf Decoder / gRPC Inspector

Decode protobuf messages and inspect gRPC payloads. Field types.

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Public IP & Geolocation Lookup

Generate curl/fetch commands to find your public IPv4/IPv6 and geolocate any IP or domain via ipinfo.io, ip-api.com, ipgeolocation.io, ipapi.co, KeyCDN, and HackerTarget. Parse pasted geolocation JSON into a unified card (country, region, city, lat/long with accuracy radius, ISP/org, ASN, timezone, reverse DNS, proxy/VPN hints). Honest accuracy caveats. Bulk IP lookup, CSV export, curl/wget/httpie/fetch snippets, history (localStorage), shareable URL. 100% client-side — generates commands and parses output only; actual lookups require the network.

Punycode Encode/Decode

Convert between Unicode domains and Punycode (IDN). xn-- prefix.

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Query String Parser & Builder

Parse and build URL query strings. URL encoding, array params.

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Quoted-Printable Encode/Decode

Encode/decode quoted-printable format. RFC 2045, email bodies.

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Quoted-Printable Encode/Decode

Encode/decode quoted-printable format. RFC 2045, email bodies.

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Random Bytes Generator

Generate cryptographically secure random bytes. Hex/base64 output.

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Random Date / Time Generator

Generate random dates and times within any range, in any format (ISO 8601, Unix epoch seconds/millis, locale, custom strftime-like pattern, relative 'time ago'), across time zones, with business-day filter, granularity (date/datetime/time), sorted/unique output, seeded reproducibility (mulberry32), and bulk export to CSV/JSON. 100% client-side.

Random IP & MAC Address Generator

Generate random IPv4 (with private/public/reserved scope + CIDR/range filters), IPv6 (full + compressed), and MAC addresses (with bundled IEEE OUI vendor prefixes, 4 formats, unicast/multicast + LAA/UAA bits) in bulk for network testing. Includes subnet helper and reverse lookup (MAC vendor + IP scope/class). 100% client-side — fixtures only.

Random Number Generator (Seeded)

Generate reproducible random numbers with four PRNG algorithms (mulberry32, LCG, xorshift, Mersenne-Twister), four distributions (uniform, normal, exponential, Poisson), unique-set mode, weighted choice, histogram preview, bulk export to CSV/JSON, plus a clearly-labeled crypto-secure CSPRNG mode. Seeded for reproducibility. 100% client-side.

Random String Generator

Generate random strings. Custom charset, length, pattern, CSPRNG.

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Random User Profile Generator

Generate coherent fake user profiles with 50+ correlated fields (name, email, phone, address, avatar, company, job, login, etc.). Multi-profile batch, JSON/CSV/XML export, seedable reproducibility, algorithmic (non-real) avatars. 100% client-side.

Rate Limit & Retry-After Calculator

Calculate rate limits, retry-after delays, backoff strategies. Token bucket.

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README Generator

Scaffold a professional README.md from clickable section blocks — title, badges, description, auto-TOC, installation, usage, features, API, contributing, license — with project templates (npm, GitHub, library, CLI, profile), an inline Shields.io badge builder, a license picker with full SPDX text (MIT, Apache-2.0, GPL-3.0, …), import of existing READMEs, and a live preview. 100% client-side.

Recurring Date RRULE Generator

Build and parse iCalendar RRULE recurrence strings per RFC 5545 §3.8.5.3. Two-way editor: build via UI or paste an RRULE, instantly see the plain-English meaning and the next N concrete occurrences. Full support for FREQ (SECONDLY / MINUTELY / HOURLY / DAILY / WEEKLY / MONTHLY / YEARLY), INTERVAL, COUNT, UNTIL, BYDAY with ordinals, BYMONTHDAY, BYYEARDAY, BYWEEKNO, BYMONTH, BYSETPOS, WKST, EXDATE / RDATE. DST-aware UNTIL handling. Export VEVENT .ics and code snippets for rrule.js + python-dateutil. 100% client-side.

Red-Black Tree Visualizer

Step-by-step visualization of CLRS-style Red-Black tree insert and delete with full fix-up — every recolor and rotation labeled by case (insert cases 1-5, delete cases 1-6). Live five-property checklist with pass/fail (root black, no red-red, NIL black, equal black-height, valid colors), per-node red/black coloring, black-height display, in-order traversal, bulk insert, and shareable tree-state URLs. 100% client-side.

Redis Command Reference & Builder

Searchable Redis command reference with an interactive builder. Browse 50+ commands across STRING, LIST, SET, HASH, SORTED SET, KEY, PUB/SUB, STREAM, SERVER, CLUSTER and more. Per-command syntax, args, Big-O complexity, version, safety warnings, and one-click client code in redis-cli / node-redis / redis-py / Jedis. 100% client-side.

Regex Cheatsheet

Comprehensive regex cheatsheet. Character classes, anchors, quantifiers.

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Regex Explainer

Explain regular expressions in plain English. Step-by-step breakdown.

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Regex Generator

Generate regex from examples. Match patterns, extract data, common regex library.

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Regex Match Highlighter

Highlight regex matches in text. Capture groups, multiple matches.

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Regex Replace

Replace text using regular expressions. Capture groups, functions.

Regex Tester

Test regular expressions with live highlighting. Flags, capture groups, replace, cheat sheet.

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Regex Tester & Debugger

Test and debug regex with step-by-step execution. Match info, flags.

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Regex to Code (JS/Python/PHP)

Convert regex patterns to code in JavaScript, Python, PHP.

Relative Time (Time Ago) Formatter

Format any timestamp as a relative phrase ('2 hours ago', 'in 3 days', 'just now') across 5 locales (en, es, fr, de, ja) with auto unit selection, configurable thresholds, numeric 'always' vs 'auto' modes, multi-locale preview grid, and copy-paste code snippets for Intl.RelativeTimeFormat, Luxon, Day.js, and date-fns. 100% client-side.

Remove Duplicate Lines

Remove duplicate lines from text. Case-insensitive, preserve order, count.

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Remove Line Breaks

Remove line breaks from text. Join with space or custom separator.

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REST API Client / HTTP Request Builder

Build and send HTTP requests. GET/POST/PUT/DELETE, headers, body, auth.

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Reverse DNS (PTR) Lookup Generator

Generate reverse DNS (PTR) lookup commands for any IPv4 or IPv6 address or CIDR. Builds the exact in-addr.arpa / ip6.arpa reverse-zone query name, plus ready-to-paste dig / nslookup / kdig (DoH) / host commands against Google, Cloudflare, Quad9, OpenDNS, or a custom resolver. Parses PTR zone records, builds a forward-confirmed reverse DNS (FCrDNS) chain, flags private/loopback/link-local IPs, and generates batch scripts. 100% client-side — generates commands only; actual lookups require running them in your terminal.

Reverse Lines / Text

Reverse lines, words, or characters in text. Multiple modes.

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Reverse Lines / Text

Reverse lines, words, or characters in text. Multiple modes.

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Roman Numeral Converter

Convert between Arabic numbers and Roman numerals both ways. Standard mode (1–3999) and vinculum mode (1–3,999,999 with overline ×1000). Strict vs lenient grammar validation (reject IIII / IC or allow clock-style). Additive/subtractive breakdown (e.g. MCMXCIV = 1000 + 900 + 90 + 4). Batch-convert lists, year helper, copy result, history of Roman numerals reference. 100% client-side, no network.

ROT13/ROT47 Cipher

Encode/decode ROT13 and ROT47 ciphers. ASCII rotation, self-inverse.

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RSA Encrypt/Decrypt

Encrypt/decrypt with RSA keys. OAEP padding, SHA-256, key import.

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RSA Key Pair Generator

Generate RSA key pairs using WebCrypto. 2048/4096-bit, PEM/JWK export.

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RSA Key Pair Generator

Generate RSA key pairs using WebCrypto. 2048/4096-bit, PEM/JWK.

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rsync Command Builder

Build correct rsync commands from a visual UI — local, push, and pull direction, trailing-slash visualizer (src/ copies contents vs src copies the dir), archive -a, verbose -v, compress -z, human -h, progress --progress, --delete (guarded with dry-run nudge), --delete-excluded, --exclude / --exclude-from, --partial, --bwlimit, --checksum, --numeric-ids, SSH transport (-e 'ssh -i key -p port'), preserve-detail breakdown of -a as -rlptgoD. Per-flag plain-English explanation, recipe library, history (max 20), shareable URL. 100% client-side — commands are generated, never executed.

Sample JSON / Mock API Response Generator

Generate realistic mock API responses from a JSON Schema or example. REST single/array, paginated envelopes, JSON:API, GraphQL, error templates, and webhook payloads. Status codes, headers, MSW snippet. 100% client-side.

Scientific & Engineering Notation Converter (SI Prefix, E-Notation)

Convert numbers between decimal, scientific (a × 10^b), engineering (exponent multiple of 3), SI-prefixed (12.3k, 4.7µ), and E-notation (1.5e-9) — with adjustable significant figures, exact BigInt mantissa math, full SI prefix table from yocto to quetta (plus binary IEC prefixes), batch list conversion, and rounding-mode selection. 100% client-side & offline.

scrypt Hash Generator

Generate scrypt password hashes. N, r, p parameters, salt, hash length.

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scrypt Hash Generator

Generate scrypt password hashes. N, r, p parameters, salt.

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SCSS to CSS Compiler

Compile SCSS to CSS. Nesting, variables, mixins, functions.

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SCSS to CSS Compiler

Compile SCSS to CSS. Nesting, variables, mixins, functions.

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Secret Key Generator (Base64)

Generate random secret keys. Base64/hex, custom length, CSPRNG.

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Secret Key Generator (Base64)

Generate random secret keys. Base64/hex, custom length, CSPRNG.

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sed Command Builder & Tester

Build and test sed commands against sample text in the browser. A pure-JavaScript sed interpreter (no WASM, no network) supports substitute (s///), delete (d), print (p), insert (i), append (a), change (c), and next (n) commands with line addressing (single line, range, $, /regex/), BRE and ERE (-E) regex flavours, flags (g, i, p, N), -n suppress-auto-print, -i in-place preview, auto delimiter selection (/, |, #, ~, ^) when search/replace contains a slash, GNU-vs-BSD -i guidance, backreference helper (\1..\9 and &), and per-command plain-English explanation. Visual builder, reverse explainer, recipe library, sample-text presets, history (max 20), shareable URL. Preview only — never edits real files. 100% client-side.

SemVer Calculator & Range Tester

Calculate and test semantic version ranges. ^, ~, >=, *, prerelease.

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SemVer Calculator & Range Tester

Calculate and test semantic version ranges. ^, ~, >=, prerelease.

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Server-Sent Events (SSE) Tester

Test SSE endpoints. Connect, listen, inspect events. Reconnection logic.

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SHA-1 Hash Generator

Generate SHA-1 hashes using WebCrypto. Text/file, hex/base64.

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SHA-1 Hash Generator

Generate SHA-1 hashes using WebCrypto. Text/file, hex/base64.

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SHA-256 Hash Generator

Generate SHA-256 hashes using WebCrypto. Text/file, hex/base64.

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SHA-256 Hash Generator

Generate SHA-256 hashes using WebCrypto. Text/file, hex/base64.

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SHA-3 Hash Generator

Generate SHA-3 (Keccak) hashes. SHA3-256, SHA3-512, pure JS.

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SHA-3 Hash Generator

Generate SHA-3 (Keccak) hashes. SHA3-256, SHA3-512, pure JS.

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SHA-512 Hash Generator

Generate SHA-512 hashes using WebCrypto. Text/file, hex/base64.

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SHA-512 Hash Generator

Generate SHA-512 hashes using WebCrypto. Text/file, hex/base64.

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Shell Command Explainer

Paste any shell command line and get every token (command, flags, flag-values, positionals, operators) explained from a bundled offline manpage/tldr dataset. Splits combined short flags (ls -la → -l + -a), knows which flags take a value, decomposes pipelines (|, &&, ||, ;), redirections (> >> < 2>&1 &>), and flags destructive commands (rm -rf, dd of=/dev/sdX, mkfs, chmod 777, fork bombs). 100% client-side; nothing uploaded.

Shell Script Linter (ShellCheck)

Lint shell scripts. Bash, sh, zsh. Common mistakes, suggestions.

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Slug Generator

Generate URL-friendly slugs from text. Lowercase, hyphens, strip special chars.

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Sort Lines

Sort lines alphabetically, numerically, by length, natural sort. Custom order.

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Sort Lines

Sort lines alphabetically, numerically, by length, natural sort.

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Sorting Algorithm Visualizer

Step-by-step visualization of 11 sorting algorithms (bubble, cocktail, selection, insertion, shell, gnome, merge, quick, heap, counting, radix) with live comparison / swap / array-access counters, custom array input, presets (random, reversed, nearly-sorted, few-unique), play / pause / step-forward / step-back controls, side-by-side race mode, per-algorithm complexity + stability cards, and shareable URLs. 100% client-side.

Source Map Visualizer

Visualize JavaScript source maps. Original vs generated, tree view.

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SPF Record Generator & Validator

Build a valid SPF TXT record from a guided form (ip4, ip6, a, mx, include, redirect, all qualifier — -all / ~all / ?all / +all) and validate any existing record against RFC 7208. Live lookup-count meter tracks the 10 DNS-lookup limit, mechanism-order checker, deprecated ptr warnings, multiple-SPF-record detection, macro warnings, and a dig command generator. Plain-English mechanism explanations and suggested fixes for every validation issue. 100% client-side generation; recursive lookup counting uses an optional include-depth map or a clearly-labeled live-DNS mode.

SQL DDL to ER Diagram Generator

Paste any-dialect SQL DDL (CREATE TABLE / ALTER TABLE) and instantly render an ER diagram as Mermaid erDiagram code, ASCII crow's-foot diagram, and DBML. Detects PKs, UNIQUE, composite keys, inline and table-level foreign keys, ALTER TABLE ADD FOREIGN KEY, and self-referencing FKs. Auto-layout, topological ordering (handles circular FKs), naming-based relationship inference when FKs are absent. 100% client-side, no signup.

SQL Dialect Converter

Convert SQL between MySQL, PostgreSQL, SQLite, SQL Server, and Oracle — deterministically, in your browser. Handles identifier quoting, LIMIT/TOP/ROWNUM, AUTO_INCREMENT/SERIAL/IDENTITY, string concat, date functions, and common data types. Side-by-side change notes; unconvertible constructs are flagged, never silently mistranslated.

SQL EXPLAIN Plan Visualizer

Parse and visualize SQL EXPLAIN / EXPLAIN ANALYZE output (PostgreSQL text + JSON, MySQL JSON, SQL Server XML) as an interactive tree. Per-node scan type, cost, rows (estimate vs actual), timing, loops, buffers. Detects bottlenecks and row-misestimates with plain-English advice. 100% client-side; plans never leave the browser.

SQL Formatter / Beautifier

Format and beautify SQL queries with dialect awareness (MySQL, PostgreSQL, SQLite, SQL Server, ANSI), keyword casing, indentation, comma style, and SELECT-column alignment. Pure in-browser; no network. 100% client-side.

SQL Index Advisor

Paste a SQL query and (optionally) your table DDL; get column-ordered index recommendations with CREATE INDEX statements. Parses WHERE, JOIN, ORDER BY, and GROUP BY clauses; applies equality-before-range column ordering; detects redundant/overlapping existing indexes; warns about write-amplification, low-selectivity columns, and leading-wildcard LIKE. 100% client-side — no DB required.

SQL Join Visualizer

Visualize SQL JOINs interactively — INNER, LEFT, RIGHT, FULL OUTER, CROSS, anti-join, semi-join, and self-join — with row-accurate matching (not misleading Venn diagrams), live result preview, NULL-handling demonstration, duplicate-row multiplication explainer, step-through animation, and copyable generated SQL. 100% client-side, no DB required.

SQL Minifier

Minify and compress SQL queries into a single line — removes comments and redundant whitespace while preserving string literals and quoted identifiers exactly. Dialect-aware (--, #, /* */). 100% client-side.

SQL Result to CSV / JSON Exporter

Convert SQL query results (pasted result grids, INSERT statements, or Markdown tables) to CSV, JSON, NDJSON, TSV, Markdown, or HTML. Smart type inference (int/decimal/boolean/date/NULL), BigInt-safe numerics, escaped quotes, per-column rename/reorder/select, configurable CSV delimiter + quoting. Round-trips with CSV→SQL. 100% client-side.

SQL to ORM Code Converter

Convert CREATE TABLE DDL into idiomatic ORM models for Prisma, Sequelize, TypeORM, Drizzle, SQLAlchemy, and Django — fully offline in your browser. Maps types, nullability, defaults, primary/foreign keys, unique & index constraints, and enums, with snake_case ↔ camelCase field mapping via @map / column-name decorators. Unmappable constructs are flagged, never silently dropped.

SSH Config Generator

Visually build ~/.ssh/config host entries — HostName, User, Port, IdentityFile, IdentitiesOnly, ProxyJump/bastion, ForwardAgent, ServerAlive, Compression, LocalForward/RemoteForward/DynamicForward, StrictHostKeyChecking, Match blocks, and Include directives. Templates (basic server, jump host, GitHub, AWS EC2, wildcard), security linter (warns on StrictHostKeyChecking no / broad ForwardAgent), ed25519 keygen helper per host, import existing config, bulk-add via JSON, first-match-wins reordering, history (localStorage), and shareable URL. 100% client-side — never handles private keys. No ads.

SSL/TLS Certificate Decoder & Checker

Decode a pasted PEM X.509 certificate or CSR entirely in your browser — extract subject, issuer, validity, SAN list, key type/size, signature algorithm, serial, and SHA-1/SHA-256 fingerprints; check expiry with a live countdown; verify chain order across multiple pasted PEMs; match SANs against a hostname (wildcard-aware); flag weak signature algorithms (MD5/SHA-1) and short RSA keys (<2048); and generate the exact openssl commands (s_client, x509 -text, fingerprint, verify chain, SAN extraction) for live-host checks. 100% client-side parsing — your PEM never leaves the browser.

String Escape (JS/JSON/SQL)

Escape strings for JavaScript, JSON, SQL, HTML, regex contexts.

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String Escape (JS/JSON/SQL)

Escape strings for JavaScript, JSON, SQL, HTML, regex contexts.

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String Reverser

Reverse strings character by character, word by word, or by sentence.

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SVG Path Editor

Edit SVG paths visually. Move points, add/remove, arc/line/curve.

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SVG to JSX Converter

Convert SVG to JSX/React component. Props, className, TypeScript.

Systemd Service Unit Generator

Generate systemd service unit files. ExecStart, restart, environment.

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Tailwind to CSS Converter

Convert Tailwind utility classes to standard CSS. Expand @apply.

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Tailwind to CSS Converter

Convert Tailwind utility classes to standard CSS. Expand @apply.

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tar Archive Command Builder

Build correct tar commands from a visual UI — create / extract / list / append modes, compression (gzip .gz / bzip2 .bz2 / xz .xz / zstd .zst), verbose, exclude patterns, strip-components, target dir -C, format selector (gnu/posix/ustar/pax), preserve permissions/xattrs. Auto-matching compression flag + extension, tar-bomb and absolute-path guards, per-flag plain-English explanation, recipe library, history (max 20), shareable URL. 100% client-side — commands are generated, never executed.

Test / Dummy File Generator

Generate dummy files of an exact byte size — TXT, CSV, JSON, XML, HTML, PNG (solid color), binary, ZIP (real archive), or PDF. Bulk generate with {n} naming patterns. Random / zeros / lorem / pattern content. All client-side via Blob — nothing uploaded.

Test Data Anonymizer / Data Masking Tool

Detect and anonymize PII in CSV/JSON/free-text — emails, phones, SSNs, credit cards, names, addresses, IPs, ZIPs, DOBs. Five masking strategies (mask, pseudonymize, generalize, fake, format-preserving) with deterministic seeded mapping for referential integrity. Format-preserving masks keep Luhn-valid cards, valid email shape, and valid phone digits. 100% client-side — your real data never leaves the browser.

Test ID Generator (SSN / Tax / National ID)

Generate clearly-fake, format-valid national identifiers for testing — US SSN/EIN/ITIN, UK NINO, India PAN/Aadhaar, German Steuer-ID, Brazil CPF/CNPJ, Canada SIN, Spain NIF, France INSEE. Uses reserved/never-issued ranges where defined (SSN area 900-999, ITIN 9XX-7X-XXXX, SIN prefix 9, NINO prefix TN), correct per-country checksums (Verhoeff, Luhn, mod-11, mod-23, mod-97), validate any ID, bulk export to CSV/JSON/text. 100% client-side — test only, never real.

Text Diff Compare

Compare two text blocks line by line. Unified diff, side-by-side, highlight.

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Text Diff Compare

Compare two text blocks line by line. Unified diff, side-by-side.

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Text to Array/List Converter

Convert text to array format. JS, Python, JSON, CSV, custom separator.

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Text to Array/List Converter

Convert text to array format. JS, Python, JSON, CSV, custom separator.

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Time Duration Calculator

Add, subtract, multiply and divide time durations. Find the duration between two clock times (cross-midnight aware). Totalize multiple timesheet rows with break subtraction. Convert HH:MM:SS to decimal hours and back. 12/24h clock support, mixed-unit normalization (75s = 1m15s), multi-segment totals with CSV export. Shareable URL. 100% client-side.

Time Unit Converter

Convert between every time unit — nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, centuries — with explicit, switchable month (28/30/30.44/31) and year (365/365.25/366) definitions. BigInt-safe down to nanoseconds, so even huge magnitudes stay exact. Single input fans out to all units. Humanize mode ('1d 1h 1m 1s'), inverse parser, dev units (ticks, jiffies, frames@fps) and JS/Python code snippets. 100% client-side.

Time Zone Abbreviation & UTC Offset Reference

Searchable reference of 200+ time zone abbreviations (EST, PST, GMT, CET, JST, UTC+05:30, …) with full names, UTC offsets, DST status, IANA equivalents, and example cities. Resolves ambiguous abbreviations (CST, IST, BST, AMT) to all candidate zones. Live 'now in this zone' readout. 100% client-side, offline.

Time Zone Converter

Convert a date and time from one time zone to many others — DST-aware for any past or future date. City/zone autocomplete mapped to IANA ids. Shows UTC offset, abbreviation (IST/PST/etc.) and DST-active flag. Detects spring-forward gaps and fall-back overlaps. Live 'now' mode. Difference summary. Shareable link. 100% client-side.

tmux Config Generator & Cheatsheet

Build a .tmux.conf from a UI — prefix key (C-b / C-a / C-Space), mouse, base-index, history limit, escape-time, vi/emacs mode, split bindings, status bar (position/colors/left/right), and TPM plugin wiring. Version-aware (2.9 vs 3.x style syntax). Live preview with per-line comments + searchable 60+ keybinding cheatsheet reflecting YOUR custom bindings. 100% client-side.

TOML to JSON Converter

Convert TOML configuration to JSON. Tables, arrays, inline tables.

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TOTP/2FA Code Generator

Generate TOTP 2FA codes from secrets. 6/8 digits, 30s/60s period.

TOTP/2FA Code Generator

Generate TOTP 2FA codes from secrets. 6/8 digits, 30s/60s period.

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Traceroute Visualizer

Generate ready-to-paste tracert (Windows), traceroute (Linux/macOS) and mtr commands with hop-limit, timeout, probe-count and no-resolve flags. Paste any traceroute / tracert / mtr output and parse it into a structured hop list (hop number, IP, hostname, RTT × N) — visualized as a table, an ASCII latency graph, and CSV/JSON exports. Highlights the slowest hop, the biggest inter-hop latency jump, timeouts (*), private RFC1918 hops and IPv6 hops. 100% client-side — actual traceroute requires the OS CLI; this tool generates commands and parses pasted output.

Trie (Prefix Tree) Visualizer

Step-by-step visualization of a Trie (prefix tree) — insert, search, delete (with node pruning), and autocomplete — with animated character path, end-of-word markers, and shared-prefix highlighting. Live node count, word count, and space-savings metrics showing how shared prefixes save memory. Longest-common-prefix display. Optional compressed (radix / Patricia) trie view. Bulk insert from a word list. Step / reverse / play / speed controls and shareable state URLs. 100% client-side.

Trim Whitespace

Trim leading/trailing whitespace. Collapse multiple spaces, remove empty lines.

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TSConfig JSON Generator

Generate tsconfig.json files. Target, module, strict, paths, JSX.

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Two's Complement / Signed Integer Calculator

Convert between signed decimal and two's-complement binary at any width (4/8/16/32/64-bit or custom up to 256-bit). Step-by-step negation (invert → +1), one's-complement and sign-magnitude side-by-side, clickable bit grid with MSB sign bit highlighted, hex/octal views, range & overflow detection, and sign-extension / truncation visualization. BigInt-correct, fully client-side.

TypeScript Playground

Compile and run TypeScript in browser. Type checking, ES features.

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TypeScript to JavaScript Compiler

Compile TypeScript to JavaScript. Target ES5-ES2024, module formats.

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TypeScript to JavaScript Compiler

Compile TypeScript to JavaScript. Target ES5-ES2024, module formats.

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ULID Generator

Generate ULIDs (Universally Unique Lexicographically Sortable IDs).

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Unicode Escape/Unescape

Convert between Unicode characters and \uXXXX escape sequences.

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Unix Timestamp / Epoch Converter

Convert between Unix timestamps and human-readable dates both directions. Auto-detects seconds / milliseconds / microseconds / nanoseconds with BigInt precision. Multi-epoch support: UNIX, JS ms, Windows FILETIME, LDAP/NT, NTP, Cocoa/Apple (2001), Excel serial, Mongo ObjectId. Outputs ISO 8601, RFC 2822, locale, day-of-week, relative. Batch convert thousands of rows. 100% client-side.

URL Encode/Decode

Encode/decode URL components. Percent-encoding for query params, paths, fragments.

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URL Encoder / Decoder

Encode URLs or components for safe transmission, or decode percent-encoded URLs back to plain text. UTF-8 safe.

URL-safe Base64

Encode/decode URL-safe Base64 (- and _ instead of + and /).

User-Agent String Generator & Parser

Parse any User-Agent string into browser, engine, OS, CPU, device, and bot info — or generate realistic random UAs (Chrome, Firefox, Safari, Edge, mobile, bots) weighted by market share. Bulk export to CSV/JSON/Playwright array. 100% client-side.

UTF-8 Byte Viewer

View text as UTF-8 bytes. Hex, binary, decimal, character mapping.

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UTF-8 Byte Viewer

View text as UTF-8 bytes. Hex, binary, decimal, character mapping.

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UUID Generator

Generate RFC 4122 v4 UUIDs in bulk, with optional hyphens, uppercase, and prefix options. Uses crypto.randomUUID — 100% private.

UUID Generator v2

Generate UUID v1, v3, v4, v5. Bulk generation, format options, validation.

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UUID v1 Generator

Generate UUID v1 (time-based). Bulk, format options, MAC address.

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UUID v1 Generator

Generate UUID v1 (time-based). Bulk, format options, MAC address.

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UUID v4 Generator

Generate UUID v4 (random). Bulk, format options, validation.

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UUID v4 Generator

Generate UUID v4 (random). Bulk, format options, validation.

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UUID v5 Generator

Generate UUID v5 (namespace+name). DNS, URL, OID, custom namespace.

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UUID v5 Generator

Generate UUID v5 (namespace+name). DNS, URL, OID, custom namespace.

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var to let/const Converter

Convert var declarations to let/const. Scope analysis, const detection.

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Vim Cheatsheet & Keybinding Reference

Searchable, interactive Vim/Neovim cheatsheet with 100+ commands across movement, editing, insert, visual, search/replace, registers, marks, folding, windows/tabs, and exiting. Includes an interactive keyboard map (per-mode meanings), a verb+noun grammar explainer (operator × motion × text-object), reverse intent lookup ('delete inside quotes' → di"), and a .vimrc snippet generator. 100% client-side.

Visual SQL Query Builder

Build SQL SELECT queries visually — pick tables, choose columns, add WHERE filters, JOINs, GROUP BY, HAVING, ORDER BY, LIMIT/OFFSET — and generate clean, dialect-correct SQL live. No DB connection, 100% client-side. Supports MySQL, PostgreSQL, SQLite, SQL Server, ANSI.

Webhook Tester & Inspector

Inspect incoming webhooks. Generate test URLs, view payloads, headers, verify signatures.

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Webhook Tester & Inspector

Inspect incoming webhooks. Generate test URLs, view payloads, signatures.

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WebSocket Client Tester

Test WebSocket connections. Send/receive messages, inspect frames, ping/pong.

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WebSocket Client Tester

Test WebSocket connections. Send/receive messages, inspect frames.

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Week Number (ISO 8601) Calculator

Calculate the ISO 8601 week number for any date and the reverse (year + week → date range). Supports ISO 8601 (Mon-start, week 1 = first Thursday), US (Sun-start), Simple (Jan 1-7), and Middle-Eastern (Sat-start) conventions. Whole-year week grid. Week-53 detection. Cross-year boundary handling. 100% client-side.

Well-Known / Common Ports Reference

Instant, offline-searchable reference of 100+ common TCP/UDP ports and their services (HTTP 80, HTTPS 443, SSH 22, FTP 21, SMTP 25, DNS 53, RDP 3389, MySQL 3306, PostgreSQL 5432, Redis 6379, MongoDB 27017, …). Two-way search by port number or service name, TCP/UDP/both filter, well-known (0–1023) / registered (1024–49151) / dynamic (49152–65535) grouping, category tags (web, mail, db, remote, file-transfer, …), security notes for risky ports (Telnet 23, RDP 3389, SMB 445), encrypted-alternative hints (FTP → FTPS, HTTP → HTTPS, Telnet → SSH), range view, and copy/export a custom cheat sheet. 100% client-side — the IANA/Wikipedia-derived dataset is bundled and runs entirely offline.

Whitespace/Invisible Char Detector

Detect invisible characters in text. Tabs, spaces, zero-width, BOM.

WHOIS Domain & IP Lookup

Generate WHOIS query commands (whois CLI, RDAP URL) for any domain or IP, parse raw WHOIS response text into a structured card (registrar, created/updated/expiry dates, nameservers, EPP status codes explained, DNSSEC flag), detect the RIR for an IP (ARIN/RIPE/APNIC/LACNIC/AFRINIC), and generate domain-availability checker commands. EPP status code explainer with plain-English descriptions, expiry countdown, IDN/punycode handling, bulk lookup, TLD→WHOIS-server map. 100% client-side — generates commands and parses pasted output only; actual lookups require the network.

Word/Character/Line Counter

Count words, characters, lines, sentences, paragraphs in text.

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Word/Character/Line Counter

Count words, characters, lines, sentences, paragraphs in text.

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World Clock & Meeting Planner

Show the current time across 400+ cities and find the best meeting slot across time zones with a color-coded 24-hour grid. Per-zone work hours, weekend definition, DST-aware. Best-slot finder ranks top suggestions. Export to .ics, Google Calendar, Outlook. Shareable URL. 100% client-side.

XML to JSON Converter

Convert XML to JSON. Attributes, namespaces, arrays, text content.

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XOR Cipher

Encrypt/decrypt with XOR cipher. Hex/text key, UTF-8 safe.

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YAML to JSON Converter

Convert YAML to JSON. Multi-document, anchors, custom tags.

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